DS stands for dissolved solids. They are used to measure solids in a water sample (basically the amount of tiny gunk floating around in them). The more solids in a sample, the greater its ability to conduct an electrical current which is how this meter operates.

Your answer was helpful. I put a new 9 volt battery in it & on the scale water registered at 80, pure rubbing alcohol registered at zero, and beer registered at the top of the scale over 500. Other than that I don't know what to do with the meter

Does anyone know how to build a Paramagnetic Soil Meter?Does anyone know how to build one of these, a Paramagnetic Count Soil Meter, follow the link. http://www.nutri-tech.com.au/downloads/ … 0Meter.pdf I know it...

Does anyone know if there is a word in either sociology or anthropology, that describes the...phenomenon of two subjects influencing each other - each becoming more like the other in the process? For example A and B...